Thermal stability of magnesium-rich primers based on glycidyl carbamate resins

摘要

Coatings of outstanding thermal stability were obtained by the combination of two novel technologies, that of a magnesium-rich primer and a silane-modified glycidyl carbamate binder. The intial objective of the study was to evaluate the new binder system with respect to overall film properties to be used in the magnesium-rich primer. However, during thermogravimetric analysis of samples, previously unobserved and unexpected properties were noted. The samples transformed into an intact residue, with the amount of the residual char ranging between 60 to 90% weight depending on the pigment volume concentration (PVC) of the composition. It appears that the hitherto unobserved property is essentially a function of the metallic pigment particles in the coating. The discovery of the exceptional thermal stability potentially increases the range of application for these primers and can be further developed for use as a thermal barrier coating.